An efficient methodology for utilization of K-feldspar and phosphogypsum with reduced energy consumption and CO2 emissions  

作　　者：Zhixi Gan Zheng Cui Hairong Yue Siyang Tang Changjun Liu Chun Li Bin Liang Heping Xie Zhixi Gan;Zheng Cui;Hairong Yue;Siyang Tang;Changjun Liu;Chun Li;Bin Liang;Heping Xie(Multi-phases Mass Transfer and Reaction Engineering Laboratory, College of Chemical Engineering Sichuan University, Chengdu 610065, China;Center of CCUS and C02 Mineralization and Utilization, Sichuan University, Chengdu 610065, China)

机构地区：[1]Multi-phases Mass Transfer and Reaction Engineering Laboratory, College of Chemical Engineering Sichuan University, Chengdu 610065, China [2]Center of CCUS and C02 Mineralization and Utilization, Sichuan University, Chengdu 610065, China

出　　处：《Chinese Journal of Chemical Engineering》2016年第11期1541-1551,共11页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(21336004);the State Key Research Plan of the Ministry of Science and Technology(2013BAC12B03)

摘　　要：The issues of reducing CO_2 emissions, sustainably utilizing natural mineral resources, and dealing with industrial waste offer challenges for sustainable development in energy and the environment. We propose an efficient methodology via the co-reaction of K-feldspar and phosphogypsum for the extraction of soluble potassium salts and recovery of SO_2 with reduced CO_2 emission and energy consumption. The results of characterization and reactivity evaluation indicated that the partial melting of K-feldspar and phosphogypsum in the hightemperature co-reaction significantly facilitated the reduction of phosphogypsum to SO_2 and the exchange of K^+(K-feldspar) with Ca^(2+)(CaSO_4 in phosphogypsum). The reaction parameters were systematically investigated with the highest sulfur recovery ratio of ~ 60% and K extraction ratio of ~ 87.7%. This novel methodology possesses an energy consumption reduction of ~ 28% and CO_2 emission reduction of ~ 55% comparing with the present typical commercial technologies for utilization of K-feldspar and the treatment of phosphogypsum.The issues of reducing CO_2 emissions, sustainably utilizing natural mineral resources, and dealing with industrial waste offer challenges for sustainable development in energy and the environment. We propose an efficient methodology via the co-reaction of K-feldspar and phosphogypsum for the extraction of soluble potassium salts and recovery of SO_2 with reduced CO_2 emission and energy consumption. The results of characterization and reactivity evaluation indicated that the partial melting of K-feldspar and phosphogypsum in the hightemperature co-reaction significantly facilitated the reduction of phosphogypsum to SO_2 and the exchange of K~＋（K-feldspar） with Ca^（2＋）（CaSO_4 in phosphogypsum）. The reaction parameters were systematically investigated with the highest sulfur recovery ratio of ~ 60% and K extraction ratio of ~ 87.7%. This novel methodology possesses an energy consumption reduction of ~ 28% and CO_2 emission reduction of ~ 55% comparing with the present typical commercial technologies for utilization of K-feldspar and the treatment of phosphogypsum.

关 键 词：Waste treatment Reactivity Mineralization K-feldspar CO2 emission reduction 

分 类 号：X701[环境科学与工程—环境工程] TQ177.375[化学工程—硅酸盐工业]